Deltoid pain while benching

It seems like every time I bench, it feels like a tremendous amount of pressure is put on my deltoid and I end up getting a decent amount of pain in that area. Anyone have any idea what this could be from?

I'm not lifting too heavy, doing sets of 10 at the moment and it happens in flat and incline...then proceeds to hurt during other chest exercises. I was wondering if I needed to widen or narrow my grip to fix the problem.

Well I benched again the other day and changed where the bar hit, made it hit lower and did not have the problems I did before. I used a hammer strength machine. I noticed after reading about it how flared up my arms were when bringing the bar to that position I use to, and how much more natural it was to bring it down lower on the chest. My gym's dumbbells only go to 60lbs so using them for benching is useless.......